split: replace internal packages with images library

Remove all the internal package that are now in the
github.com/osbuild/images package and vendor it.

A new function in internal/blueprint/ converts from an osbuild-composer
blueprint to an images blueprint.  This is necessary for keeping the
blueprint implementation in both packages.  In the future, the images
package will change the blueprint (and most likely rename it) and it
will only be part of the osbuild-composer internals and interface.  The
Convert() function will be responsible for converting the blueprint into
the new configuration object.

vendor/github.com/osbuild/images/pkg/disk/btrfs.go

@@ -0,0 +1,158 @@
+package disk
+
+import (
+	"fmt"
+	"math/rand"
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+type Btrfs struct {
+	UUID       string
+	Label      string
+	Mountpoint string
+	Subvolumes []BtrfsSubvolume
+}
+
+func (b *Btrfs) IsContainer() bool {
+	return true
+}
+
+func (b *Btrfs) Clone() Entity {
+	if b == nil {
+		return nil
+	}
+
+	clone := &Btrfs{
+		UUID:       b.UUID,
+		Label:      b.Label,
+		Mountpoint: b.Mountpoint,
+		Subvolumes: make([]BtrfsSubvolume, len(b.Subvolumes)),
+	}
+
+	for idx, subvol := range b.Subvolumes {
+		entClone := subvol.Clone()
+		svClone, cloneOk := entClone.(*BtrfsSubvolume)
+		if !cloneOk {
+			panic("BtrfsSubvolume.Clone() returned an Entity that cannot be converted to *BtrfsSubvolume; this is a programming error")
+		}
+		clone.Subvolumes[idx] = *svClone
+	}
+
+	return clone
+}
+
+func (b *Btrfs) GetItemCount() uint {
+	return uint(len(b.Subvolumes))
+}
+
+func (b *Btrfs) GetChild(n uint) Entity {
+	return &b.Subvolumes[n]
+}
+func (b *Btrfs) CreateMountpoint(mountpoint string, size uint64) (Entity, error) {
+	name := mountpoint
+	if name == "/" {
+		name = "root"
+	}
+	subvolume := BtrfsSubvolume{
+		Size:       size,
+		Mountpoint: mountpoint,
+		GroupID:    0,
+		UUID:       b.UUID, // subvolumes inherit UUID of main volume
+		Name:       name,
+	}
+
+	b.Subvolumes = append(b.Subvolumes, subvolume)
+	return &b.Subvolumes[len(b.Subvolumes)-1], nil
+}
+
+func (b *Btrfs) AlignUp(size uint64) uint64 {
+	return size // No extra alignment necessary for subvolumes
+}
+
+func (b *Btrfs) GenUUID(rng *rand.Rand) {
+	if b.UUID == "" {
+		b.UUID = uuid.Must(newRandomUUIDFromReader(rng)).String()
+	}
+}
+
+type BtrfsSubvolume struct {
+	Name       string
+	Size       uint64
+	Mountpoint string
+	GroupID    uint64
+
+	MntOps string
+
+	// UUID of the parent volume
+	UUID string
+}
+
+func (subvol *BtrfsSubvolume) IsContainer() bool {
+	return false
+}
+
+func (bs *BtrfsSubvolume) Clone() Entity {
+	if bs == nil {
+		return nil
+	}
+
+	return &BtrfsSubvolume{
+		Name:       bs.Name,
+		Size:       bs.Size,
+		Mountpoint: bs.Mountpoint,
+		GroupID:    bs.GroupID,
+		MntOps:     bs.MntOps,
+		UUID:       bs.UUID,
+	}
+}
+
+func (bs *BtrfsSubvolume) GetSize() uint64 {
+	if bs == nil {
+		return 0
+	}
+	return bs.Size
+}
+
+func (bs *BtrfsSubvolume) EnsureSize(s uint64) bool {
+	if s > bs.Size {
+		bs.Size = s
+		return true
+	}
+	return false
+}
+
+func (bs *BtrfsSubvolume) GetMountpoint() string {
+	if bs == nil {
+		return ""
+	}
+	return bs.Mountpoint
+}
+
+func (bs *BtrfsSubvolume) GetFSType() string {
+	return "btrfs"
+}
+
+func (bs *BtrfsSubvolume) GetFSSpec() FSSpec {
+	if bs == nil {
+		return FSSpec{}
+	}
+	return FSSpec{
+		UUID:  bs.UUID,
+		Label: bs.Name,
+	}
+}
+
+func (bs *BtrfsSubvolume) GetFSTabOptions() FSTabOptions {
+	if bs == nil {
+		return FSTabOptions{}
+	}
+
+	ops := strings.Join([]string{bs.MntOps, fmt.Sprintf("subvol=%s", bs.Name)}, ",")
+	return FSTabOptions{
+		MntOps: ops,
+		Freq:   0,
+		PassNo: 0,
+	}
+}